1 /*
2  * Copyright (c) 2023 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <linux/landlock.h>
18 #include <sys/prctl.h>
19 #include <sys/stat.h>
20 #include <sys/syscall.h>
21 
22 #include <stddef.h>
23 
24 #ifndef landlock_create_ruleset
25 static inline int
26 landlock_create_ruleset(const struct landlock_ruleset_attr *attr, size_t size,
27     __u32 flags)
28 {
29 	return syscall(__NR_landlock_create_ruleset, attr, size, flags);
30 }
31 #endif
32 
33 int
34 main(void)
35 {
36 	int rfd;
37 	const struct landlock_ruleset_attr rsattr = {
38 		.handled_access_fs =	LANDLOCK_ACCESS_FS_READ_FILE |
39 					LANDLOCK_ACCESS_FS_READ_DIR
40 	};
41 
42 	rfd = landlock_create_ruleset(&rsattr, sizeof(rsattr), 0);
43 	return rfd == -1;
44 }